Ignore errors from nmake, we expect some right now

build_release.py

 #!/usr/bin/env python
 
 import sys, os, re, subprocess
 
 if len(sys.argv) < 2:
   print >>sys.stderr, "Please add a command line parameter with the path of the signing key file"
   sys.exit(1)
 
 basedir = os.path.dirname(os.path.abspath(sys.argv[0]))
 key = sys.argv[1]
@@ skipping 30 matching lines @@
     "msbuild",
     os.path.join(basedir, "build", arch, "adblockplus.sln"),
     "/p:Configuration=Release", "/target:AdblockPlus;AdblockPlusEngine",
   ])
 
   sign(os.path.join(basedir, "build", arch, "Release", "AdblockPlus.dll"),
       os.path.join(basedir, "build", arch, "Release", "AdblockPlusEngine.exe"))
 
 installerParams = os.environ.copy()
 installerParams["VERSION"] = version
-subprocess.check_call(["nmake", "/A"], env=installerParams, cwd=os.path.join(basedir, "installer"))
+try:
+  subprocess.check_call(["nmake", "/A"], env=installerParams, cwd=os.path.join(basedir, "installer"))
+except subprocess.CalledProcessError:
+  print("An error occurred during nmake, continuing anyway")
 sign(os.path.join(basedir, "build", "ia32", "adblockplusie-%s-en-us-ia32.msi" % version),
     os.path.join(basedir, "build", "x64", "adblockplusie-%s-en-us-x64.msi" % version))